In the early 19th century, a deadly disease known as smallpox wreaked havoc on societies around the world. The author of the passage clearly demonstrates their awareness of the infectious nature of smallpox through various references and descriptions throughout the text.
One key piece of evidence that supports this claim is the mention of smallpox as a highly contagious disease that spreads rapidly among populations. The author describes how smallpox outbreaks would often lead to widespread panic and fear among communities, highlighting the infectious nature of the disease.
Additionally, the author discusses the importance of quarantine measures in containing the spread of smallpox, further underscoring their understanding of the disease's infectious nature. Quarantine was a common practice during smallpox outbreaks to prevent the further transmission of the virus to uninfected individuals.